Compositions and method of use of substituted guanidines

ABSTRACT

THE PREPARATION OF 1,3-BIS(4- AND 3,4-SUBSTITUTED BENZYLIDENEAMINO)GUANIDINES AND SALTS, AND OF 1-LOWERALKYL - 1,3-BIS(4- AND 3,4-SUBSTITUTED BENZYLIDENEAMINO) GAUNIDINES AND THEIR SALTS AND OF 1,3-DILOWERALKYL-1,3-BIS (4- AND 3,4-SUBSTITUTED BENZYLIDENEAMINO)GUANIDINES AND THEIR SALTS FROM 1,3-DIAMINOGUANDINE AND ITS SALTS, AND FROM 1-LOWERALKYL-1,3-DIAMINOGUANIDINE ND ITS SALTS AND FROM 1,3-DIAMINO-1,3-DILOWER-ALKYLGUANIDINE AND ITS SALTS, RESPECTIVELY, AND N-LOWERALKANOYL DERIVATIVES THEREOF. THE COMPOSITIONS AND COMPOUNDS PREPARED HAVE ANTIPROTOZOAL ACTIVITY PARTICULARLY AGAINST COCCIDIOSIS AND MALARIA.

United States Patent 3,769,432 COMPOSITIONS AND METHOD OF USE OF SUBSTITUTED GUANIDINES Andrew Stephen Tomcufcik, Old Tappan, N.J., assignor to American Cyanamid Company, Stamford, Conn. No Drawing. Continuation-impart of application Ser. No. 833,167, June 13, 1969, which is a continuation-in-part of application Ser. No. 741,247, July 1, 1968, both now abandoned. This application Dec. 2, 1970, Ser.

Int. Cl. A61k 27/00 U.S. Cl. 424-326 15 Claims ABSTRACT OF THE DISCLOSURE This application is a continuation-in-part of my application Ser. No. 833,167, filed June 13, 1969, now abandoned which is a continuation-in-part of application Ser. No. 741,247, filed July 1, 1968, now abandoned.

The new compositions of the present invention contain as the active component compounds of the following formula:

H I I R1 8 Ha a wherein R and R are selected from the group consisting of halogen, trifluoromethyl, trifiuoromethoxy, and cyano, R and R are selected from the group consisting of hydrogen and halogen, R R R and R are selected from the group consisting of hydrogen and lower alkyl, and R is selected from the group consisting of hydrogen and lower alkanoyl, is a single or double bond, n is an integer selected from 0 and 1 with the proviso that when 2 is a double bond then n is 0 and when is a single bond, the n is 1, and the pharmacologically acceptable acid salts thereof.

The acid salts can be, for example, nitrate, hydrochloride, hydrobromide, methosulfate, and the like.

The term loweralkyl is intended to include those having 1 to 4 carbon atoms and lower alkanoyl, those having 1 to 4 carbons in addition to the carbonyl group. The term halogen includes chlorine, bromine, fluorine, and iodine.

The compounds of this invention are, in general, crystalline solids, ranging in color from white to pale yellow,

slightly soluble in water and lower alcohols and insoluble in benzene, toluene and chloroform.

The present invention also includes new bis (benzylideneamino) guanidines of the formula:

wherein R R R R R R R and n are as defined hereinbefore, and pharmacologically acceptable acid salts thereof.

The above active components and novel compounds can be prepared by reacting a compound of the formula:

wherein R R and R are as hereinabove described, dissolved in a water miscible organic solvent, with an aqueous or aqueous alcoholic solution of a compound of the formula:

wherein R is as hereinabove described and X is the anion of a pharmacologically acceptable acid. The mixture is heated to from 50 C. to the boiling point of the solvent and held there for from one to ten minutes and then cooled to room temperature. The precipitated product is collected, washed with ethanol and/or ether and dried.

Other methods of preparing the instant compounds are illustrated by the equations which follows:

B. If: io

where R1, R2, R3, R4, R5, R5, R7, R3, :2, n and X are as hereinabove described and R is lower alkyl.

Some of the instant compounds herein described, wherein R and R are the same, R and R are the same, R and R are the same, R and R are the same, and R is hydrogen, are prepared by the equation illustrated as follows:

scribed and Z is chlorine or bromine.

Compounds in which R is loweralkanoyl are prepared by reaction of the compounds in which R is H with the appropriate organic acid anhydride.

(E) The following process is directed to a lithium aluminum hydride reduction of the saturated guanidine to yield the dihydro derivative of the parent. The process is generally carried out in anhydrous ether under an inert 4 atmosphere, such as a blanket of nitrogen. The reaction is illustrated below.

a a I l R4 Qt rr -r-rt-Q a a 1 a a Ha R1 R6 lithium aluminum hydride wherein R R R R R R R 2 and n are as heretofore described and R and R are halogen, trifiuoromethyl or trifluoromethoxy.

Among the active components and novel compounds within the scope of the present invention are the following:

1, 3-bis (4-ch1orobenzy1ideneamino guanidine nitrate,

1,3-bis(4-chlorobenzylideneamino)guanidine hydrochloride,

1,3-bis(4-chlorobenzylideneamino guanidine methosulfate,

1,3-bis 4-bromobenzylideneamino guanidine nitrate,

1,3-bis 4-bromobenzylideneamino guanidine hydrochloride,

1,3-bis(3,4-dichlorobenzylideneamino guanidine nitrate 1,3-bis 3,4-dichlorobenzylideneamino guanidine hydrochloride,

1,3-bis 4-cyanobenzylideneamino guanidine nitrate,

1,3-bis 4-cyanobenzylideneamino guanidine hydrochloride,

l,3-bis 4-chloroa-methy1benzy1ideneamino guanidine nitrate,

1,3-bis (4-ch1oro-a-methylbenzylideneamino guanidine hydrochloride,

1- (4-bromobenzylideneamino -3 (4-cyanobenzylideneamino) guanidine hydrobromide,

1- (4-bromobenzylideneamino -3 (4-ch1orobenzylideneamino) guanidine hydrochloride,

1,3-bis 4-chlorobenzylideneamino) l ,3-dimethylguanidine,

1,3-bis (4-chlorobenzylideneamino l,3,-dibuty1guanidine hydrobromide,

1,3-bis(4-chlorobenzylideneamino)-2-acety1guanidine, and

1, 3-bis(4-chlorobenzylidene)-1-methylguanidine hydrobromide.

The active components and novel compounds of the present invention are highly active antiprotozoal agents in warm-blooded animals. For example, these compounds have anticoccidial activity against Eimeria tenella as shown by the following test: The animals were Peterson Cross Cockerels, 7 days old and of approximately equal size and weight. These cockerels were divided into groups and the groups were placed in separate cages with wire floors. Medicated and control diets were then presented to the groups of birds 2 days before inoculation while they were still in uncontaminated quarters. During the entire period of the tests, the birds ate and drank ad libitum. Control groups were maintained on a standard Immedicated commercial type chicken diet. Test groups were maintained on the same standard diet in which a measured concentration of test compound had been incorporated homogeneously. The cockerels were inoculated once orally with sporulated oocysts of Eimeria tenella. The number of oocysts inoculated directly into the crops of all cockerels in the tests was sufiicient to produce high mortality in the untreated controls. The quantity necessary to produce high mortality was determined prior to the times of inoculation by giving graded quantities of oocysts to comparable birds. Seven days following inoculation the tests were terminated and the mortality rate was recorded for each group. The results of these tests appear in Table I and show conclusively that these compounds are highly It is anticipated that the compounds of this invention will prove widely useful in a variety of vehicles, modes or means of administration or dispersal for the purpose of minimizing, preventing, controlling, treating, ameliorating or curing protozoal infections with sensitive orgaeifective as anticoccidial agents. The tests represent very 5 nisms. One of these infections is coccidiosis which is a severe laboratory challenges, and lower concentrations protozoan parasitic disease widespread in animals, causthan those shown would be effective under practical field ing a greater economic loss among domestic and game conditions. animals in temperate climates than any other protozoan TABLE I Parts per Number million of birds Percent Compound Salt in diet treated survival 0 100 32 1,3-bis( t-chlorobenzylideneamiuo)guanidine Nitrate g $3 3% 64 30 100 0 40 28 DO Methosulfate 60 40 98 o 20 20 Do Hydrochloride 33 20 100 0 20 45 1,3-bis(4-bromobenzylideneamino)guanidine Nitrate g8 3g 0 20 40 1,3-bls(4-chloro-a-methylbenzylideneamino)guanidine d0 60 80 250 10 100 1,3-bis(3,4-dichlorobenzylideneamjno)guanidine rln i8 38 0 20 1,3-bis(4-cyanobenzylideneamino) do 10 80 60 10 100 1,3-bis(4-iodobenzylideneamino)guanidine H01 g g 1,3-bis(4-flnorobenzylideneamino)guanidine Nitrate g 2 1,3-bis(4-trifluoromethylbenzylideneamino)guanidine Hydrochloride g 3g 0 4s 1,3-bis(4-ehlorobenzylideneamiuo)1,3-dimethylguanidine Hydrobromide 120 10 100 0 5 100 0 60 47 2-acetyl-L3-bis(4-chlorobenzylideneamino)guanidine g 30 a 100 1-(4-ch1orobenzylamino)-3-(4-eh1orobenzy1ideneamlno)guanidine 88 0 20 55 1,3-bis(4-trifiuoromethoxybenzylideneamino)guanidiue Hydrochloride 1g 10 80 10 100 0 20 60 1,3-bis(4-chlorobenzylamino)m do 20 10 100 The compounds of the present invention have high disease. coccidiosis is the most important animal parasitic activity against other coccidial species in chickens. Thus, disease of chickens, the causative agents being protozoa 1,3 bis(4-chlorobenzylideneamino)guanidine completely of the genus Eimeria, and is also important in other protected treated chickens from mortality due to Eimeria 50 domestic animals such as turkeys, sheep, cattle and pigs. necatrix, and from poor weight gains due to E. acervulina, The present compositions and novel compounds are E. brunetti, E. maxima or E. mivati. Methods used were active in warm-blooded animals as antimalarial agents. essentially identical with those previously cited with ap- Wh n tested in mice in the range of from 150 mg./kg. to propriate modifications. Weight gains were determined 7 300 g y Show all activity Comparable to q days after single experimental inoculations with the desig- A h administration of th C mp unds f r coccidinated species of coccidia. The results are summarized in W111 e ly be most Practical in Or h t d, Table or in the drinking water, the compounds may also be administered to individual hosts in the form of tablets, TABLE II.Anticoccidial activity (at 1,B-bis(4-chlorobenzylidenedrenches, capsules, 01' the like, 01 by injection. These me latter methods of administration are, of course, less practi- Percent cal for treatment of large groups of animals than they are Control for treating limited numbers of animals, but they are quite P.p.m. No. weight raci Eimeriaspp in diet birds Survival gain Salt gasist cal for use on a small scale or on an llldlVldual 0 19 21 31 Newmx 15 20 100 80 }Methosuuate. Wlth the compounds of the instant invention, medic- 30 20 100 103 ated feeds are usually prepared by thoroughly admixing Acervulina g 3g W n ie, about 0.0005 to 0.05% by weight and preferably about 0 20 100 76 0.0015 to 0.025% by weight of active compound with a g3 5g 188 3 Hydrochlondenutritionally balanced animal feed, as for example, the

0 20 100 53 chlck feed described in the examples hereinafter. Maxims. p 28 88 8% Do. Where it is desirable to prepare a concentrate or pre- 43 5g 1 g lgg mix for ultimate dilution in feed to the above levels, gen- Mivati 15 20 100 D0 erally about 1% to 25% and preferably about 3% to 3o 20 100 91 45 20 100 100 10% by welght of medicament 1s blended with an ed1 ble organic or inorganic carrier, e.g., cornmeal or corn and soybean meal, or alfalfa, or mineral salts containing a small amount of an edible dusting oil such as, for example, corn oil, or soybean oil. The thus prepared premix may then be added to the complete animal poultry feed prior to administration.

DETAILED DESCRIPTION The following examples described in detail the preparation of representative compounds of the present invention. In these examples the'starting materials, 4-chlorobenzaldehyde, 4 bromobenzaldehyde, 3,4 dichlorobenzaldehyde, 4 cyanobenzaldehyde and 4 chloroacetophenone are each widely used chemical reagents available from commercial sources. The compound 1,3-diaminoguanidine nitrate, or methosulfate may be prepared as described by Keim, Henry and Smith, Journal of the American Chemical Society, 72, 4944-4964 (1950). The preparation of the compound 1,3-diaminoguanidine hydrochloride is shown in Phillips and Williams, ibid, 50, 2465 (1928). The synthesis of 1,3-diamino-1-methylguanidine hydrobromide is shown by Kroeger et al., Ann. 664 156 (1963). The preparation of l,3-diamino-1,3-dimethylguanidine hydrobromide is described by McBride et al., J. Org. Chem. 22 152 (1957).

Example l.Preparation of 1,3-bis(4-chlorobenzylideneamino) guanidine nitrate, hydrochloride and methosulfate A boiling solution of 14.1 grams of 4-chlorobenzaldehyde (slight excess) in 250 milliliters of ethanol is stirred vigorously as a solution of 6.1 grams of 1,3-diaminoguanidine nitrate and 0.5 milliliter of concentrated nitric acid in 50 milliliters of water is added in one portion. The reaction mixture is stirred as the temperature recedes to room temperature. The reaction mixture is then allowed to stand for several hours. The precipitate which forms is collected, washed with hot ethanol, air-dried and finally dried at 60 C. under reduced pressure. The yield is 14.0 grams of product and the melting point is 198 C. with decomposition.

The hydrochloride or methosulfate salt may be prepared by this same procedure, substituting equivalent amounts of the appropriate guanidine salt and employing 0.5 milliliter of the appropriate acid. The hydrochloride salt melts at 289290 C. with decomposition. The methosulfate salt melts at 217-224 C. with decomposition.

Example 2.Preparation of 1,3-bis(4-chlorobenzylideneamino guanidine The free base of the title compound is prepared by suspending 8 g. of the nitrate salt (Example 1) in 200 ml. of anhydrous ethanol, adding 2.5 ml. of 10 N sodium hydroxide solution, stirring and heating until the reaction mixture becomes homogeneous, and finally cooling the solution and filtering the resultant solid. The melting point of the free base is 187-l88 C.

Example 3.Preparation of .1,3-bis(4-bromobenzylideneamino)guanidine nitrate A boiling solution of 20.0 grams of 4-bromobenzaldehyde in 250 milliliters of ethanol is stirred vigorously as a solution of 6.1 grams of 1,2-diaminoguanidine nitrate and 0.5 milliliter of concentrated nitric acid in 50 milliliters of water is added in one portion. The reaction mixture is stirred as the temperature recedes to room temperature. The reaction mixture is allowed to stand for several hours. The precipitate which forms is collected, washed with hot ethanol, air dried and finally dried at 60 C. under reduced pressure. The yield is 16.5 grams of product and the melting point is 178l80 C. with decomposition.

Example 4.Preparation of l,3-bis(3,4-dichloro- I benzylideneamino)guanidine nitrate A boiling solution of 17.6 grams of 3,4-dichlorobenzaldehyde in 250 milliliters of ethanol is stirred vigorously as a solution of 6.1 grams of 1,3-diaminoguanidine nitrate and 0.5 milliliter of concentrated nitric acid in 50 milliliters of water is added in one portion. The reaction mixture is stirred as the temperature recedes to room temperature. The reaction mixture is then allowed to stand for several hours. The precipitate which forms is collected, washed with hot ethanol, air dried and finally dried at 60 C. under reduced pressure. The yield is 17.5 grams of product and the melting point is 195196 C. with decomposition.

Example 5.-Preparation of 1,3-bis(4-cyanobenzylideneamino)guanidine nitrate A boiling solution of 13.1 grams of 4-cyanobenzaldehyde in 250 milliliters of ethanol is stirred vigorously as a solution of 6.1 grams of 1,3-diaminoguanidine nitrate and 0.5 milliliter of concentrated nitric acid in 50 milliliters of water is added in one portion. The reaction mixture is stirred as the temperature recedes to room temperature. The reaction mixture is then allowed to stand for several hours. The precipitate which forms is collected, Washed with hot ethanol, air dried and finally dried at 60 C. under reduced pressure. The yield is 15.1 grams of product and the melting point is 205 -210 C. with decomposition.

Example 6.--Preparation of 1,3-bis(4-chloro-amethylbenzylideneamino guanidine nitrate A boiling solution of 15.4 grams of 4-chloroacetophenone in 250 milliliters of ethanol is stirred vigorously as a solution of 6.1 grams of 1,3-diaminoguanidine nitrate and 0.5 milliliter of concentrated nitric acid in 50 milliliters of water is added in one portion. The reaction mixture is stirred as the temperature recedes to room temperature. The reaction mixture is then allowed to stand for several hours. The precipitate which forms is collected, washed with hot ethanol, air dried and finally dried at 60 C. under reduced pressure. The yield is 8.7 grams of product and the melting point is 215 C. with decomposition.

Example 7.-Preparation of 1,3-bis(4-iodobenzylideneamino) guanidine hydrochloride Following the procedure of Example 1 and substituting 4-iodobenzaldehyde for 4-chlorobenzaldehyde and 1,2- diaminoguanidine hydrochloride for 1,3 diarninoguanidine nitrate the product of the example is obtained. The hydrochloride has a melting point of 288-291 C., dec.

Example 8.-Preparation of 1,3-bis(4-fluorobenzylideneamino guanidine nitrate Using the procedure of Example 1 and substituting 4 fluorobenzaldehyde for 4 chlorobenzaldehyde the product of the example is obtained. The nitrate has a melting point of 169-170 C., dec.

Example 9.-Preparation of methyl thiocarbazimidate hydrochloride Excess methyl chloride is collected in a Dry Iceacetone-cooled trap and added to a tared pressure vessel containing 91.1 g. of powdered thiosemicarbazide in 600 ml. of anhydrous ethanol. Weighing the vessel plus contents shows that 53 g. of methyl chloride has been added. The reaction mixture is magnetically stirred while heating in an oil bath temperature of 77 to C. for 48 minutes. After 33 minutes, the reaction has become homogeneous. It is cooled in ice and the resultant rose-white solid filtered and dried in a vacuum oven. The yield of the title compound is 121 g. melting point 154-155 C.

Substitution of dimethyl sulfate, ethyl iodide or propyl bromide for methyl chloride and allowing the reactions to proceed in refluxing anhydrous ethanol instead of under pressure, results in the preparation of methyl thiocarbazimidate metho-sulfate, ethyl thiocarbazimidate hydroiodide, and propyl thiocarbazimidate hydrobromide, respectively.

Example 10.-Preparation of methyl 3-(4-chlorobenzylidene)thiocarbazimidate hydrochloride A solution of 3.8 g. of 4-chlorobenzaldehyde in 10 ml. of warm absolute ethanol is added all at once to a stirred solution of 5 g. of methyl thiocarbazimidate hydrochloride in 100 ml. of warm absolute alcohol. The reaction mixture is stirred at room temperature for about 15 minutes and cooled in ice. The white solid product is filtered off and air dried; melting point 212-214 C.

The following are prepared in like manner: methyl 3- (4 bromobenzylidene)thiocarbazimidate methosulfate from 4 chlorobenzaldehyde and methyl thiocarbazimidate methosulfate, ethyl 3 (4 cyanobenzylidene)thiocarbazimidate hydroiodide from 4 cyanobenzaldehyde and ethyl thiocarbazimidate hydroiodide, and propyl 3- (3,4 dichlorobenzylidene)thiocarbazimidate hydrobromide from 3,4 dichlorobenzaldehyde and propyl thiocarbazimidate hydrobromide.

Example 11.Preparation of methyl 3-(4-chlorobenzylidene)thiocarbazimidate hydrochloride A molar excess of methyl chloride is added to 2.14 g. of 4-chlorobenzaldehyde thiosemicarbazone and 25 ml. of anhydrous ethanol in a pressure vessel. The reaction mixture is magnetically stirred and heated in an oil bath for 1 /2 hours. The crystalline title compound separates on cooling and is filtered otf and air dried.

Example 12.Preparation of 1,3-bis(4-chlorobenzylideneamino) guanidine hydrochloride A solution of 101 g. of 4-chlorobenzaldehyde in 40 ml. of warm 95% ethanol is added portionwise to a stirred solution of diaminoguanidine hydrochloride in 450 ml. of 90% ethanol at 70 C. Addition of the first portion causes rapid boiling and the reaction mixture is cooled to a little above room temperature before the remainder of the 4-chlorobenzaldehyde solution is added. Stirring is continued for minutes and the reaction mixture is cooled in ice, filtered, and air dried. The yield is 122 g. of solid, melting point 295 C. with decomposition.

The same product is obtained when l-amino 3 (4- chlorobenzylideneamino) guanidine hydrochloride (Exampic 13) is allowed to react under similar conditions as above with an equimolar amount of 4-chlorobenzaldehyde.

The same product is also obtained from the reaction of methyl 3 (4 chlorobenzylidene)thiocarbazimidate (Example 10) with the hydrazone of 4-chlorobenzaldehyde in refluxing 95% ethanol. The hydrazone of 4- chlorobenzaldehyde is prepared according to the procedure for the synthesis of hydrazones of aromatic aldehydes and ketones outlined in G. Newkome and D. Fishel, J. Org. Chem., 31, 677 (1966).

Example 13.Preparation of 1-amino3-(4-chloroben zylideneamino guanidine hydrochloride To a solution of 2.6 g. of methyl 3-(4-chlorobenzylidene)thiocarbazimidate in 10 ml. of boiling absolute ethanol is added 0.6 g. of hydrazine hydrate. The reaction mixture is cooled in ice and the solid 1-amino-3-(4- chlorobenzylideneamino)guanidine removed by filtration.

Similarly the reaction of methyl 3-(4-bromobenzylidene)thiocarbazimidate methosulfate, ethyl 3 (4 cyanobenzylidene)thiocarbazimidate hydroiodide, and propyl 3 (3,4 dichlorobenzylidene)thiocarbazimidate hydrobromide with hydrazine yield, respectively, l-amino- 3 (4 bromobenzylideneamino)guanidine methosulfate, 1 amino 3 (4 cyanobenzylideneamino)guanidine hy- 10 droiodide, and l amino 3 (3,4-dichlorobenzylideneamino) guanidine hydrobromide.

The reaction of 4-chlorobenzaldehyde with a 4-fold molar excess of diaminoguanidine hydrochloride in boiling ethanol also gives 1 amino 3 (4 chlorobenzylideneamino)guanidine hydrochloride, together with a small amount of 1,3-bis(4 chlorobenzylideneamino)- guanidine hydrochloride.

Example 14.-Preparation of 1 (4 bromobenzylideneamino) 3 (4-chlorobenzylideneamino)guanidine hydrochloride A solution of 1.85 g. of 4-bromobenzaldehyde in 10 ml. of ethanol is added to a solution of 2.48 g. of l-amino- 3 (4 chlorobenzylideneamino)guanidine hydrochloride in 25 ml. of boiling ethanol. The reaction mixture is cooled and the solid product removed by filtration and air dried.

In a similar manner the reaction of 1-amino-3-(4- bromobenzylideneamino)guanidine methosulfate with 4- chlorobenzaldehyde gives the methosulfate salt of the subject compound. The reaction of l-amino-3-(4-cyanobenzylideneamino)guanidine hydroiodide with 4-chlorobenzaldehyde gives 1-(4-chlorobenzylideneamino)-3(4- cyanobenzylideneamino)guanidine hydroiodide. The reaction of 1 amino-3 (3,4 dichlorobenzylideneamino) guanidine hydrobromide and p-chlorobenzaldehyde gives 1-(4-chlorobenzylideneamino) 3 (3,4-dichlorobenzylideneamino) guanidine hydrobromide.

Example 15.Preparation of chick diet The following specific feed composition is an example of poultry feed as a carrier for the coccidiostats described hereinbefore.

Percent Vitamin-amino acid 0 5 Trace minerals 0.1 Sodium chloride 0.3 Dicalcium phosphate 1.2 Ground limestone 0.5 Stabilized fat 4 Dehydrated alfalfa, 17% protein 2 Corn gluten meal, 41% protein 5 Menhaden fish meal, 60% protein 5 Soybean oil meal, 44% protein 30 Ground yellow corn, fine, to

The vitamin pre-mix in the above feed composition is prepared from the following formulation. The expressions of quantity relate to units per kilogram of the feed Ground yellow corn, fine, to 5 gm.

Example 16.Preparation of 1,3-bis(4-trifluoromethylbenzylideneamino) guanidine hydrochloride A solution of 10 g. of 4-trifluoromethylbenzaldehyde in the minimum of 95% ethanol is added to a boiling solution of 3.6 g. of diaminoguanidine hydrochloride in 50 ml. of 95 ethanol and a few ml. of water. The solution is stirred and allowed to cool and the solid removed by filtration and washed with 95 ethanol and ether. The yield is 9.6 g. of white solid with a melting point of 272-2735 with decomposition.

Example 17.-Preparation of 1,3-bis(4-chlorobenzylideneamino)-1,3-dimethylguanidine hydrobromide A mixture of 14.1 grams of 4-chlorobenzaldehyde, 4.6 grams of methylhydrazine and 500 m1. of dried benzene is stirred at reflux in a continuous water removal apparatus until no further separation of water is noted. The benzene solution of the resultant methylhydrazone of 4- chlorobenzaldehyde is cooled to room temperature and treated with a solution of 5.3 grams of cyanogen bromide in 100 m1. of benzene. The reaction mixture is stirred at reflux for four hours, a white precipitate separating out during this time. The precipitate is filtered from the hot solution, washed and dried. It is recrystallized from ethanol to yield 4.0 grams of the pure compound melting at 223 -225 C. with decomposition.

The same compound is obtained when two molar equivalents of 4-chlorobenzaldehyde and one molar equivalent of 1,3 diamino 1,3 dimethylguanidine hydrobromide are refluxed in ethanol solution in the presence of a little 48% aqueous hydrobromic acid for a few minutes.

Example 18.Preparation of 1,3- bis(4-chlorobenzylideneamino)-l,3-di-n-butylguanidine hydrobromide The preparation of the above compound is carried out by the procedure of Example 17, an equivalent of n-butylhydrazine replacing the methylhydrazine. The isolated product after recrystallization from ethanol-diethyl ether decomposes at about 150 C.

Example 19.Preparation of 1,3-bis(4-chlorobenzylideneamino)-l-methylguanidine hydrobromide The preparation of the title compound is carried out essentially by the procedure of Example 1, 7.3 grams of 1,3-diamino-l-methylguanidine hydrobromide replacing the 1,3-diaminoguanidine nitrate and 0.5 ml. of 48% HBr being employed as catalyst. The yield of product is 15.4 grams and the melting point is 27 6-278" C.

Example 20.--Preparation of 2-acetyl-1,3-bis(4-chlorobenzylideneamino)guanidine A mixture of 20 g. of 1,3-bis(p-chlorobenzylideneamino)-guanidine free base and 9 ml. of acetic anhydride in 300 ml. of anhydrous ether is stirred at reflux for 16 hours, then filtered to give a solid containing starting material and acetylated material. The solid is reacted with an additional 3 ml. of acetic anhydride in 300 ml. of toluene for 1 hour, cooled to room temperature and filtered. The solid (14 g.) is dissolved in 100 ml. of chloroform and treated with 50 ml. of 3 N hydrochloric acid, and the resulting solid is filtered, the crude product is slurried in 100 ml. of boiling chloroform, filtered, and dried to give 7.2 g. of 2-acetyl-1,3-bis(4-chlorobenzy1- ideneamino) guanidine hydrochloride, melting point 193-4 C.

The hydrochloride salt is partitioned between chloroform and aqueous sodium bicarbonate, and the chloroform layer is dried and evaporated to give 2-acetyl-1,3- bis(4-chlorobenzylideneamino)guanidine, melting point 197200 C. (dec.).

The reaction of 1,3-bis(p-chlorobenzylideneamino)- guanidine free base with acetyl chloride in ether gives the same acetyl derivatives according to thin layer chromatograiphic evidence, along with recovered starting material.

When, 1,3 bis(p-chlorobenzylideneamino) 1,3 dimethylguanidine free base is submitted to the above reaction conditions with acetic anhydride, there is obtained the corresponding 2-acetyl-1,3-bis(4-chlorobenzylideneamino)-1,3-dimethylguanidine.

Similarly, the reaction of 1,3-bis(4-cyanobenzylideneamino)guanidine and propionic anhydride in refluxing ether gives 1,3-bis(4-cyanobenzylideneamino) 2 propionyl guanidine.

Example 21.Preparation of l-(4-chlorobenzylamino)- 3- (4-chlorobenzylideneamino gu anidine A mixture of 0.95 g. (0.025 mole) of lithium aluminum hydride in ml. of anhydrous ether is stirred under nitrogen as 4.0 g. (0.012 mole) of 1,3-bis(p-chlorobenzylideneamino) guanidine free base is added in portions over a five-minute period. The reaction turns green, and finally brown with gas evolution during the addition. After adding an additional 100 ml. of ether and stirring at room temperature for 3% hours, the reaction mixture is poured over 500 ml. of ice-Water mixture with stirring, calcium carbonate added to facilitate separation of the phases, and the yellow ethereal layer separated. The aqueous layer is washed with 50 ml. of ether, and the combined ether layers washed with two 50 ml. portions of water, then cooled to 5 and filtered to give 1.3 g. of yellow 1-(4- chlorobenzylamino) 3 (4 chlorobenzylideneamino) guanidine, melting point -173. Additional material may be obtained from the mother liquors.

The same compound is synthesized by the reaction of equimolar quantities of p-chlorobenzylhydrazine and methyl-3-(4-ch1orobenzylidene)thiocarbazimidate hydrochloride (see Example 10) in hot ethanol. It is also prepared by the reaction of equimolar amounts of l-(pchlorobenzyl)-S-methylisothiosemicarbazide and hydrazine in warm ethanol, which affords 1-amino-3-(p-chlorobenzylamino)guanidine, followed by treatment of the latter with an equimolar quantity of p-chlorobenzaldehyde in hot isopropanol.

Example 22.Preparation of 1,3-bis(4-chlorobenzylamino) guanidine hydroiodide The starting materials for this reaction are literature compounds and are prepared in the following manner. p- Chlorobenzylhydrazine from heating p-chlorobenzyl chloride with excess hydrazine hydrate in i-propanol and distilling: F. E. Anderson et al., J. Med. and Pharm. Chem., 5, 221 (1962). l-(p-chloro benzyl)-S-methylisothiosemicarbazide hydroiodide is made from methyl iodide treatment in refluxing ethanol of l-(p-chlorobenzyl)thiosemicarbazide, which in turn is made from 4% sodium amalgam in refluxing 80% ethanol reduction of p-chlorobenzaldehyde thiosemicarbazone: E. Hoggarth and E. H. P. Young, J. Chem. Soc., 1582 (1950).

A solution of 0.7 g. (4.5 mmole) of p-chlorobenzylhydrazine and 1.6 g. (4.5 mmole) of 1-(p-chlorobenzyl)- S-methylisothiosemicarbazide hydroiodide in 25 ml. of tetrahydrofuran is heated at reflux for one hour, then rotary evaporated to give a semisolid product which is dissolved in 10 ml. of hot tetrahydrofuran and diluted with ether to give an oil which crystallizes on standing in the cold. Collection and recrystallization from chloroformmethylene chloride-ether gives 1,3-bis-(4-chlorobenzylamino)guanidine hydroiodide, melting point 142-145 C.

Example 23.Preparation of 1,3-bis(4-trifluoromethoxybenzylideneamino)guanidine hydrochloride A micro 3-neck flask filled with 0.60 g. (0.025 g. equivalent) of magnesium turnings is flame-dried under nitrogen, then 5 ml. of anhydrous ether is added followed by 1 ml. of a solution of 5.0 g. (0.021 mole) of p-bromophenyltrifluoromethyl ether in 10 ml. of anhydrous ether. The reaction mixture is stirred under nitrogen for two hours or until the Grignard reaction begins; remaining solution is added dropwise, allowing the mixture to reflux from the heat of reaction. After addition is complete, 5 m1. of ether is added and stirring continued an additional /2 hour.

To the resulting Grignard solution is added dropwise with stirring under nitrogen 3.0 g. (0.022 mole) of N- methylformanilide in 5 m1. of ether at such a rate as to cause mild reflux of the mixture. After addition is complete, the reaction mixture is stirred an additional hour and 25 ml. of 10% sulfuric acid solution cautiously added 13 dropwise. When all the Mg has dissolved, the aqueous layer is separated and washed with two 20 ml. portions of ether, and the combined ethereal layers washed with saturated sodium bicarbonate solution, Water, and saturated sodium chloride solution (20 ml. of each), and dried (magnesium sulfate). Evaporating solvent gives 5.4 g. of a red oil containing about 20% of the desired aldehyde (estimated from integration of the NMR signals for aldehydric and aromatic protons).

I claim:

1. A composition for the control of coccidiosis infections in poultry comprising a solid edible carrier and about between 0.0005 and 0.05% by weight of a substituted guanidine compound of the formula:

wherein R and R are selected from the group consisting of halogen, trifluoromethyl, trifluoromethoxy and cyano, R and R are selected from the group consisting of hydrogen and halogen, R R R and R are selected from the group consisting of hydrogen and lower alkyl, R is selected from the group consisting of hydrogen and lower alkanoyl, I is a single or double bond, n is an integer selected from 0 and 1 with the proviso that when 2 is a double bond then It is O and when I is a single bond the n is 1 and the pharmaceutically acceptable acid salts thereof.

2. A composition according to claim 1, wherein said compound is administered in a solid edible carrier containing about between 0.0015% and 0.025% by weight of said compound.

3. A composition according to claim 2, wherein said compound is 1,3-bis(4-chlorobenzylideneamino)guanidine hydrochloride.

4. The composition according to claim 1, wherein the! substituted guanidine is 1,3 bis(4 chlorobenzylideneamino) guanidine.

5. The composition according to claim 1, wherein the substituted guanidine is 1,3 bis(4 bromobenzylideneamino) guanidine.

6. The composition according to claim 1, wherein the substituted guanidine is 1,3-bis(3,4-dichlorobenzylideneamino) guanidine.

7. The composition according to claim 1, wherein the substituted guanidine is l-(4-chlorobenzylamino)-3-(4- chlorobenzylideneamino) guanidine.

8. The composition according to claim 1, wherein the substituted guanidine is 1,3 bis(4 chlorobenzylamino) guanidine hydroiodide.

9. A method of controlling a protozoa of the group consisting of coccidia and malaria in warm-blooded animals comprising administering orally or parenterally to said animals a protozoacidally effective amount of a compound of the formula: 1

wherein R and R are selected from the group consisting of halogen, trifluoromethyl and cyano, R and R are selected from the group consisting of hydrogen and halogen, R R R and R are selected from the group consisting of hydrogen and lower alkyl; R is selected from the group consisting of hydrogen and lower alkanoyl, is a single or double bond, n is an integer selected from 0 and 1 with the proviso that when I is a double bond then n is 0 and when is a single bond, the n is 1 and pharmacologically acceptable acid salts thereof.

10. The method according to claim 9, wherein the compound is 1,3 bis(4 chlorobenzylideneamino)guanidine hydrochloride.

11. The method according to claim 9, wherein the compound is 1,3-bis(4-chlorobenzylideneamino)guanidine.

12. The method according to claim 9, wherein the compound is 1,3 bis(4 bromobenzylideneamino)- guanidine.

13. The method according to claim 9, wherein the compound is 1,3-bis(3,4-dichlorobenzylideneamino)guanidine.

14. The method according to claim 9, wherein the compound is 1-(4-chlorobenzylamino) 3 (4 chlorobenzylideneamino guanidine 15. The method according to claim 9, wherein the compound is 1,3-bis(4-chlorobenzylamino)-guanidine hydroiodide.

References Cited Lieber et al.: J. Org. Chem., vol. 7, 1952, pp. 518-522.

JEROME D. GOLDBERG, Primary Examiner US. Cl. X.R. 260 465, 564 F 

